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Full text of "Metallurgy Of Cast Iron"

METALLURGY   OF   CAST   IRON.
At M, Fig. 84, is seen an iron pattern from which sand or chill moulds may be made. At A, Fig-. 85, is an iron box three inches square by eleven inches long1, in
FIG. 85.
which the pattern M has been moulded to make a dry sand mould and is filled with molten metal. The cut shows a moulder in the act of pouring the contents
-he gases could rise upward to find relief through the cope or top part of the mould, and which, if not well vented, or of a porous and fairly dry character, will then often hold the gases from going further and form cavities in the cope side of castings, such as seen at T in sample No. 23 of the same figure.